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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41eb187af54a4a702776ceca018545af37c8482d50a3f6a08811ccb1d431a3e5' 
  AND token = 'mnkLU5YblIi3a4AhLGGRjGwvfIwPjR03IOtuppvFOPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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