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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d53a79499e2d9fa05f1100d694ec79ef120d62d8b8efc4937d7de13dea96487' 
  AND token = 'gvGA85FHt38Jy3cN6kcVhJtL3A0xWyZ3sqplRNcu/ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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