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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde9a8b04e70d1188b28578b7e685ff4a823fa75724a538b1ea1129d0753b0f3' 
  AND token = 'bUv+qo6DNpJvA3G6PsQDLF7chfTdsh1vKOnrNa88RHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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