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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e40160ec5f584e731ad82bbd105bdc4f3025edf0e745cd24079e1d639bee29' 
  AND token = 'nGJuh3G2gCMrao5TlGErmzIgf+i0AhPuXrSCphCxMJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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