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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13fe6c26fb88cbc19c0276a2ee78da7f2376be225fa4b50fe3172be6239321e' 
  AND token = 'ybjS5hBjQA1hS+XUtkmDrZ6i5LslOiXAjFho41TlnfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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