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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63a0e14093b828e2f968739bb1f3b49bb81a76ac7eba35346bc6d2cf84e5899' 
  AND token = 'cAuuaO9oTp0WRLwKOkI05XkTRh4Pto6s8TL12FZlSs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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