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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e9c280730156042e6e15a79fcbd9d1878ee2888bc7a115f33e6cf9c3f9ee46' 
  AND token = '7Q85LPVbYqg9EsQ/pVg3vcx6KXM3ZsrVbmoDC4lIu3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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