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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a4e99064c3ad1d09cbbf79699d0b0b80682a880cb5238e014a264802a186a9' 
  AND token = 'WErpaafIF2cZ20ULb+Wi09sBqkWdNSgsKXMt04ose3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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