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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a31e95d58046f0795d69f2b77549656d0e970a35e61d0df681a0b26b8e9ba9' 
  AND token = '5R1lviDptnzCTgcz/amGdemXQ4oZL+JRbmgchmxNDVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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