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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cb9e3fe395c22311ef30c8372e74e43be3ad7c3fa7e5742cebddf696a80f87' 
  AND token = 'zhpRgZCDihauLhMX4C435njbbrK58b1BaaeNzknQZ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}