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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb00640d91a887c3f2702a74ace9a7ab5490d0953853cc6100598e6b3814ce7' 
  AND token = 'b/hZhlDUKEQp8ygleOU9m94P3nBRD48WUxkAfLyVKhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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