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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb86dc6e090f2fb0e963b1b696887ad443561071444cc2dfdd56fbfa88a7f92' 
  AND token = 'tRAF2XIGRrL6WLp3iJQwxWLRq++bex4nG/xY8To1efk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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