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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c29675714a6846526ed0ae5e4d1b726f18a2ba5d03ef2f199531072c52e221' 
  AND token = 'rFHkpCzkInPOcZywDnvZLk7GeNTHRv3f/r3PIXByYXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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