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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e9d173cb9aa2ac871d410909d146187a3d115b7920b2b50fd75258e749e670' 
  AND token = 'TwnK88GMldjpEQyPm9XMfrQ/CVJ+5V5Q1P9J3CLwFpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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