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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930e9424f5dfbbdd11c3895685799f13e8ff004352cfed95625a482311fe2cc0' 
  AND token = '+0/mODrdFQQeOG7cS7xNSzsxegBaGMReJb03b2Ryn4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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