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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcb90d03992bd1e1795b3ba55330a0eab629799d57a8417df9d0e3607452dcd' 
  AND token = 'VZCjAmOVuln8pgOIKHAcr4zETk6LjiCXip+YVkap2y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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