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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c568c3e36532a98c2b70b514dd8e973e85479dc9e7aabba9d828d8a6fa395' 
  AND token = '0JzJmBr8DxaetmCfW3OepQbL/1sZBCoWIrZ3jf883Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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