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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566c67c726700bdeefb98cef1cc692edb417828f620af1512cc2ff41aa411ee3' 
  AND token = 'PriFtriwqEdIKdU5LanjmltEN6MPebTN3lmm7ItTnfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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