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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5890175f016173aa44ef71157ce999d48534e6f35ef484d6d872791183077f2' 
  AND token = 'EXMEXZeUP+LokqRE2ZEcCaa5OcoswQ+lKfeL9+63O5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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