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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367a7a847c45a1e2799661d83612eb5984da9500028d8c66eb239d2f649bf4ed' 
  AND token = 'Bi2aaHKpn3SShei5F0wi9e6oik1kbs2ghjRP5hC4pYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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