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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da172c1a34fdd287c6b6bf5f7858cf6aba2bea119f14139dcfbe0b52f41f7d2' 
  AND token = 'cK5GPGl/nrDTUX4bseQP6gYz9v0YmQ5ObKOajs5Hzfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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