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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eafc92900037fec9abc325400fe168b04f03e73d979536499ef53c8c1f5209c' 
  AND token = 'wkUj3a5tC17GmZ76oOEFBwdWM3d13PkpGB8wUAxKS7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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