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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17ee3a3b4d7a1b8c09a1d06defd29e12fd4f256c2651798a4614faf93f1216e' 
  AND token = 'd2taeWNHIKdxyh3sc9jFkG77xX2VBSpGM0/THfmFeQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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