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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc252249969a1dd83d2225bec8c2aa7a23d041d177e21e7c4d04f83338261f04' 
  AND token = 'rZPc/PYenlH5QpfX4i9bXAx774yViBNlHcMe7JvU7k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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