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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e1e4393485c1bebacc47b7ffd1bbb9199dcf2b1781c4457dbf387fd5cd83db' 
  AND token = '6GC7CCJPMgGw6F5PT9nzb/uTdLIYEmaZ9AJCdOD+flY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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