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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9175d777060d322132caec0d31cde60a6d240c59d2ba87c0c1a8a46c0727ddd5' 
  AND token = 'k7raiaXZNaoeWCHxd3sH5RsnT+H2Ep7lNA22H7ttklE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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