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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d8852bf417ef295ccceabd0293c3b17498ca1e7a8dd634f4fe3844c7f8373d' 
  AND token = 'SHYvoB4mfkm9CP3UQiLGhuIo/mhAxl3wSrCk4LSqtSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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