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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3eb69679613d0219c6da94d4defd283df950cff9e0db2ad95ded963a7d6272' 
  AND token = '1Ub98N0bXPMBDRJwjc44LAbCFBeFm/SMKB0AukVK7Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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