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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc674fc7e171ec98f6ce92797e1782389109bbdaa47109494fbd5ae7c1eea46' 
  AND token = 'w9QYV0NgMCkoh36OZrnOHQiT6LDZphnckIF5NskV/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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