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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61576b5fd1aa09ec98c7a62ba6122a9b67ad676d4ddfea37d57f511351f7d83e' 
  AND token = 'WtskkxbNiS7lBsZFcwKeEvOi1xvRsV2V6jjdl+9tGnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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