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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51599814d417e236aa38f4fd18ddf77f1a1ec2a53e3552243d4a89e788ac9c14' 
  AND token = 'mDUFUhghFuk4NvzDueuqlbRLvTpVOQJpmO4DOEgOoVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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