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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e84b8ff8b354f919353c240b130e140bca142f1f7b78b29b028dd146acc1642' 
  AND token = '8qtm7fQTjU7+Tnmpug3xP7M0bwkASeeugQffXU5dStk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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