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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c101d75399b4d4959b4abfbda6f5cadb264d0240eccd5ea3b10601feaf3f7cc2' 
  AND token = 'MEanzv3YWNengUVt1a1O60l5DEABRolG1AwIwP12kT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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