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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161c23a369dd5d489614fb7e68280ac7571743aa0988dad187cd87c69eea8a56' 
  AND token = 'RJcAdQp6Bj1U5F/KRtEpJimRax/qqwYJ5pQ2F5qKbuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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