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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa7bc7cfb3318137d067e8c910538c59fd31d3915570962fae9ddfa2ab1dce6' 
  AND token = 'JeK3yiGSUTh7BLBGZIlNPOjHUK+DuRDyjP66w1TASP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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