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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e07d0be3f1911ae36b2bb3fe74caf7b671eb2858a2a6b6b14e87e1721fbaed' 
  AND token = '+ZH8QscWeocUJm5MkiUIlx6KaoPLEpA0hr6lwm8JPIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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