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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb264ad3f11339302e1017e23c59473cb256bc7888d80a24ad5edc332a92295' 
  AND token = 'wOwoBcH20x3abLVjMqg1wLQ+9j0Bf0/wmYlyXhuP5M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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