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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fb490437a803d925d55e5de7c3e38e0272a8ba4b33a658a3540e92c04fcc4c' 
  AND token = 'VqFWreLdc0LbqyymgNkYx0Is2DHlvQQdoQC/ih2Nh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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