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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe2c7c6251cdf4934ab1214d59f5a185f85604c9281585226b39cd7a6b58d75' 
  AND token = 'rDKqPBPntPP2C5I+Kvc3YnPut2CURobGtFucOs3CRcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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