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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fee10399955ec2e56d70c9a974f460b217a0f58970000347616974608d03d2e' 
  AND token = 'qKNWjoeS+eJ2ooK4lfnVB6LTrcMO2EEdHgmZ1ImGnYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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