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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948f34ea2eaba08fd68e0bad76cea4468ba8b33ced048b60bd742b717ef8af55' 
  AND token = 'scf/wIk9T5WRLjrhHapm89Rs1Yh7JIhNBD/hh50q3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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