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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd76d7b4f5618057000c8995d08aed64f5f17719f7d2d7f140b654051f1fdee5' 
  AND token = 'OvUPQ0ujiW8zt7Eupu8a/XDMg96sNkaNovrmcPselds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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