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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7f6facc8166e6d45e16959130fef47c6bb87867935705349de24c46a27561d' 
  AND token = 'jJVrcNuofdr3tFHDfGqAcW/FycZdvYA9L8REGTluF5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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