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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae370a0d1cfb069e886d7ae7389e21a6c7af8173bab1ad10dfb5698af2a6c87' 
  AND token = 'ZPXrv+SQwP/XLk8lWYMCtz9HkNxgFoTIuHLe4QUmBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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