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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8340d5c58d8c2a6bc19aa3893e1ae7a77c38af3819cc40f624b228ff39783053' 
  AND token = 'rPD+r0d4zD5NKfe5JPl2agDyNpR2ZsJXjViWR9vOZzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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