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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695727d5518d2e953c75dcaf6f97bfbcd22c640d66acd9589c7ddde3aafb0a0a' 
  AND token = 'kmCi3OQ5qhOfxBUisnOjRthNzPWH4jbU+67rStUypFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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