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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c028c1d760f31b88c79a9e03ad88a36485f6b85aa3fa1d7381e7de53239305' 
  AND token = '+B5429S5e6OC0kXwK1LS4K6iHfH4YGz6I1s14+p/NXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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