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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e947fd5f5096cf84a9ac0c1d4500f7fbf352f84cee11413e54faabc08e015c' 
  AND token = 'k04hYFjv0jzwcYjGrjvd52FqBBvN+9rRlxX/U7pLDq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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