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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e313b097c8053f9c92e926c291d85603f1a2bfa5ba851f0c194b14744940c5d' 
  AND token = '1oQobfvtD13y/DgotIX8jJXXKiDXsFOewzDNPBn/QNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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