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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554e49026db1966fe1688bb4dc0f80e95a9123762d3de8111deead3fc0bdd9fc' 
  AND token = '8XIIb2rm4d6tIBXYXiHz9MoUl3xpgNX4hzld7wNktS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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