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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b790277e93cce7117e9d1bcc897eab06f6b526fc6ef5e0b9bd5d0e46336c4d23' 
  AND token = 'rrtiLiKR4LwnLbC/gtfNSfJnWW+5Z7Ejt1SKkR3LR9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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