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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fb7564c41b26998bcd0ce19b6be5c6016aa95ee16e757b91246e9bb983dd0e' 
  AND token = 'fDxR4S781hDL2fVSEAQ5ox5W82K2I6aKaPOdt0dPyyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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