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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d394a271007e5a573b0acfb2e2fc31b5d05f10b66435cf157f2425d7e872384' 
  AND token = '8zpKnwYC4C7dHsa3dB6Re6LBM9KJXrNqMco+kwjcYYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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