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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2d75fe0f75da3654249851e2dbf6363732acbe4e1a2a411b4cf195162c2d62' 
  AND token = 'loN1FSa5fqBNXdSQweath5ZOWDlKAK09Pbip0ErIOF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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