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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34f55eb743169bf2ed595df61a5c2c427999d9e890c18520e633f18c38f0ce4' 
  AND token = 'ITyEWXlnY9TPMu80iDkBZQNhFb04fFk2vIEB0LoJvos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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