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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fb2b3cd852e3efb2ddf42419c677b0717f9a15b19a29bf7ac485dc86def062' 
  AND token = 'n4CEn+jCNTNmydwuIlnYxX3P9wMj7daTpms9jXA/r70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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