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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b7102527260a79cc76630987da1e2ad721b4ecb8e84512f5d43e66a45fb42c' 
  AND token = 'mPWLFNkxF81vLBUtxkHzMb3kFKCBV4S7SgmI83w1qUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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